ruby: fix CVE-2025-27220

In the CGI gem before 0.4.2 for Ruby, a Regular Expression Denial
of Service (ReDoS) vulnerability exists in the Util#escapeElement method.

Reference:
https://security-tracker.debian.org/tracker/CVE-2025-27220

Upstream-patch:
https://github.com/ruby/cgi/commit/cd1eb08076c8b8e310d4d553d427763f2577a1b6

(From OE-Core rev: 8c31f8e142894f103409ee10deccc22fdeea897c)

Signed-off-by: Divya Chellam <divya.chellam@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

2 files changed, 79 insertions, 0 deletions

diff --git a/meta/recipes-devtools/ruby/ruby/CVE-2025-27220.patch b/meta/recipes-devtools/ruby/ruby/CVE-2025-27220.patch
new file mode 100644
index 0000000000..f2f8bc7f76
--- /dev/null
+++ b/meta/recipes-devtools/ruby/ruby/CVE-2025-27220.patch
@@ -0,0 +1,78 @@
+From cd1eb08076c8b8e310d4d553d427763f2577a1b6 Mon Sep 17 00:00:00 2001
+From: Hiroshi SHIBATA <hsbt@ruby-lang.org>
+Date: Fri, 21 Feb 2025 15:53:31 +0900
+Subject: [PATCH] Escape/unescape unclosed tags as well
+
+Co-authored-by: Nobuyoshi Nakada <nobu@ruby-lang.org>
+
+CVE: CVE-2025-27220
+
+Upstream-Status: Backport [https://github.com/ruby/cgi/commit/cd1eb08076c8b8e310d4d553d427763f2577a1b6]
+
+Signed-off-by: Divya Chellam <divya.chellam@windriver.com>
+---
+ lib/cgi/util.rb           |  4 ++--
+ test/cgi/test_cgi_util.rb | 18 ++++++++++++++++++
+ 2 files changed, 20 insertions(+), 2 deletions(-)
+
+diff --git a/lib/cgi/util.rb b/lib/cgi/util.rb
+index 4986e54..5f12eae 100644
+--- a/lib/cgi/util.rb
++++ b/lib/cgi/util.rb
+@@ -184,7 +184,7 @@ module CGI::Util
+   def escapeElement(string, *elements)
+     elements = elements[0] if elements[0].kind_of?(Array)
+     unless elements.empty?
+-      string.gsub(/<\/?(?:#{elements.join("|")})(?!\w)(?:.|\n)*?>/i) do
++      string.gsub(/<\/?(?:#{elements.join("|")})\b[^<>]*+>?/im) do
+         CGI.escapeHTML($&)
+       end
+     else
+@@ -204,7 +204,7 @@ module CGI::Util
+   def unescapeElement(string, *elements)
+     elements = elements[0] if elements[0].kind_of?(Array)
+     unless elements.empty?
+-      string.gsub(/&lt;\/?(?:#{elements.join("|")})(?!\w)(?:.|\n)*?&gt;/i) do
++      string.gsub(/&lt;\/?(?:#{elements.join("|")})\b(?>[^&]+|&(?![gl]t;)\w+;)*(?:&gt;)?/im) do
+         unescapeHTML($&)
+       end
+     else
+diff --git a/test/cgi/test_cgi_util.rb b/test/cgi/test_cgi_util.rb
+index b0612fc..bff77f7 100644
+--- a/test/cgi/test_cgi_util.rb
++++ b/test/cgi/test_cgi_util.rb
+@@ -269,6 +269,14 @@ class CGIUtilTest < Test::Unit::TestCase
+     assert_equal("<BR>&lt;A HREF=&quot;url&quot;&gt;&lt;/A&gt;", escapeElement('<BR><A HREF="url"></A>', ["A", "IMG"]))
+     assert_equal("<BR>&lt;A HREF=&quot;url&quot;&gt;&lt;/A&gt;", escape_element('<BR><A HREF="url"></A>', "A", "IMG"))
+     assert_equal("<BR>&lt;A HREF=&quot;url&quot;&gt;&lt;/A&gt;", escape_element('<BR><A HREF="url"></A>', ["A", "IMG"]))
++
++    assert_equal("&lt;A &lt;A HREF=&quot;url&quot;&gt;&lt;/A&gt;", escapeElement('<A <A HREF="url"></A>', "A", "IMG"))
++    assert_equal("&lt;A &lt;A HREF=&quot;url&quot;&gt;&lt;/A&gt;", escapeElement('<A <A HREF="url"></A>', ["A", "IMG"]))
++    assert_equal("&lt;A &lt;A HREF=&quot;url&quot;&gt;&lt;/A&gt;", escape_element('<A <A HREF="url"></A>', "A", "IMG"))
++    assert_equal("&lt;A &lt;A HREF=&quot;url&quot;&gt;&lt;/A&gt;", escape_element('<A <A HREF="url"></A>', ["A", "IMG"]))
++
++    assert_equal("&lt;A &lt;A ", escapeElement('<A <A ', "A", "IMG"))
++    assert_equal("&lt;A &lt;A ", escapeElement('<A <A ', ["A", "IMG"]))
+   end
+ 
+ 
+@@ -277,6 +285,16 @@ class CGIUtilTest < Test::Unit::TestCase
+     assert_equal('&lt;BR&gt;<A HREF="url"></A>', unescapeElement(escapeHTML('<BR><A HREF="url"></A>'), ["A", "IMG"]))
+     assert_equal('&lt;BR&gt;<A HREF="url"></A>', unescape_element(escapeHTML('<BR><A HREF="url"></A>'), "A", "IMG"))
+     assert_equal('&lt;BR&gt;<A HREF="url"></A>', unescape_element(escapeHTML('<BR><A HREF="url"></A>'), ["A", "IMG"]))
++
++    assert_equal('<A <A HREF="url"></A>', unescapeElement(escapeHTML('<A <A HREF="url"></A>'), "A", "IMG"))
++    assert_equal('<A <A HREF="url"></A>', unescapeElement(escapeHTML('<A <A HREF="url"></A>'), ["A", "IMG"]))
++    assert_equal('<A <A HREF="url"></A>', unescape_element(escapeHTML('<A <A HREF="url"></A>'), "A", "IMG"))
++    assert_equal('<A <A HREF="url"></A>', unescape_element(escapeHTML('<A <A HREF="url"></A>'), ["A", "IMG"]))
++
++    assert_equal('<A <A ', unescapeElement(escapeHTML('<A <A '), "A", "IMG"))
++    assert_equal('<A <A ', unescapeElement(escapeHTML('<A <A '), ["A", "IMG"]))
++    assert_equal('<A <A ', unescape_element(escapeHTML('<A <A '), "A", "IMG"))
++    assert_equal('<A <A ', unescape_element(escapeHTML('<A <A '), ["A", "IMG"]))
+   end
+ end
+ 
+-- 
+2.40.0
+
diff --git a/meta/recipes-devtools/ruby/ruby_3.3.5.bb b/meta/recipes-devtools/ruby/ruby_3.3.5.bb
index 4354107a85..c91c51657f 100644
--- a/meta/recipes-devtools/ruby/ruby_3.3.5.bb
+++ b/meta/recipes-devtools/ruby/ruby_3.3.5.bb
@@ -27,6 +27,7 @@ SRC_URI = "http://cache.ruby-lang.org/pub/ruby/${SHRT_VER}/ruby-${PV}.tar.gz \
            file://0006-Make-gemspecs-reproducible.patch \
            file://0001-vm_dump.c-Define-REG_S1-and-REG_S2-for-musl-riscv.patch \
            file://CVE-2025-27219.patch \
+           file://CVE-2025-27220.patch \
            "
 UPSTREAM_CHECK_URI = "https://www.ruby-lang.org/en/downloads/"